Device and method for detecting high-temperature resistance of asphalt on asphalt pavement

Abstract

The invention discloses an asphalt pavement asphalt high-temperature resistance detection device and a detection method thereof, and belongs to the technical field of pavement detection.The asphalt pavement asphalt high-temperature resistance detection device comprises a detection box, a bearing mechanism, a heating mechanism and a pressure applying mechanism are arranged in the detection box, and the bearing mechanism comprises a bearing seat, a bearing fixing assembly and a bearing adjusting assembly; the bearing fixing assembly is arranged on the bearing seat and used for fixing a test block placed on the bearing seat, and the bearing adjusting assembly is used for driving the bearing seat to rotate; the heating mechanism is used for heating the test block in the detection box body; the pressure applying mechanism comprises a pressure applying vertical assembly, a pressure applying horizontal assembly, an abutting frame and an abutting roller, the pressure applying horizontal assembly is used for driving the abutting frame to move in the horizontal direction, and the pressure applying vertical assembly is arranged on the abutting frame and used for driving the abutting roller to move in the vertical direction. The device has the advantages that the actual road can be simulated more truly, so that the result of the high-temperature resistance detection test is more corresponding to the actual condition of the asphalt pavement.

Description

Technical Field

[0001] This invention relates to the field of pavement testing, and in particular to a device and method for testing the high-temperature resistance of asphalt pavement. Background Technology

[0002] Asphalt pavement is a widely used pavement type in modern road engineering. The high-temperature resistance of asphalt mixtures is a key indicator affecting permanent deformation defects such as rutting and sulcus, and directly relates to the long-term service performance and service life of the pavement. Therefore, in the mix design and quality control of asphalt mixtures, it is necessary to accurately evaluate their high-temperature resistance through reliable testing to ensure that the actually paved pavement has sufficient stability and durability.

[0003] Existing high-temperature resistance testing devices typically include a testing chamber with a heating element inside to simulate a high-temperature environment and a clamping mechanism to fix the test block. During testing, the test block is first heated to a predetermined temperature, then clamped and fixed by the clamping mechanism, and vertical pressure is applied to the test block. The deformation of the test block under high temperature is then observed to achieve the test of the test block.

[0004] However, in actual roads, asphalt pavements mainly bear the vertical pressure from vehicle tires and the horizontal shear force generated when vehicles start, brake, or turn, rather than the simple pressure perpendicular to the pavement surface for a long time. Therefore, the above method of simulating load by applying vertical pressure is difficult to make the results of high-temperature performance test correspond to the actual situation of asphalt pavements. Summary of the Invention

[0005] In order to facilitate a more realistic simulation of actual roads and make the results of high-temperature performance testing more consistent with the actual conditions of asphalt pavement, this application provides a device for testing the high-temperature performance of asphalt pavement.

[0006] Firstly, this application provides a device for testing the high-temperature resistance of asphalt pavement, which adopts the following technical solution: A device for testing the high-temperature resistance of asphalt pavement includes a testing chamber, characterized in that: the testing chamber is equipped with a bearing mechanism, a heating mechanism, and a pressure applying mechanism; the bearing mechanism includes a bearing seat, a bearing fixing component, and a bearing adjusting component; the bearing fixing component is disposed on the bearing seat and used to fix the test block placed on the bearing seat; the bearing adjusting component is used to drive the bearing seat to rotate; the heating mechanism is used to heat the test block inside the testing chamber; the pressure applying mechanism includes a pressure vertical component, a pressure horizontal component, a pressure frame, and pressure rollers; the pressure horizontal component is used to drive the pressure frame to move horizontally; the pressure vertical component is disposed on the pressure frame and used to drive the pressure rollers to move vertically.

[0007] By adopting the above technical solution, the load-bearing adjustment component drives the rotation of the load-bearing seat, which, in conjunction with the horizontally and vertically movable pressure roller, facilitates the comprehensive testing of the test block under multi-angle and composite stress. Specifically, the load-bearing adjustment component drives the rotation of the load-bearing seat to simulate the oblique shear of the tires on the road surface at different slopes. The horizontal pressure component drives the horizontal movement of the pressure roller to simulate the longitudinal shear during braking / acceleration. The vertical pressure component drives the pressure roller to press down to simulate vertical loads. The combination of these three components facilitates a more realistic simulation of actual roads, thereby making the results of the high-temperature performance test more consistent with the actual conditions of asphalt pavement, and thus more realistically reflecting the complex stress and deformation behavior of asphalt pavement under high temperatures.

[0008] Optionally, the vertical pressure assembly includes a vertical cylinder vertically mounted on the pressure support frame and a mounting base mounted on the bottom of the piston rod of the vertical cylinder, with the pressure roller rotatably engaged with the mounting base; the horizontal pressure assembly includes a horizontal cylinder horizontally mounted inside the detection chamber, with the pressure support frame mounted on the piston rod of the horizontal cylinder.

[0009] By adopting the above technical solution, when the horizontal cylinder drives its own piston rod to move, it drives the entire pressure frame to move horizontally. When the vertical cylinder drives its own piston rod to move, it drives the pressure roller to press vertically downward. This makes it easy to simulate the horizontal shear force generated by the vehicle against the road surface and the vehicle load. The setting of the cylinder as a power source makes the control of the pressure roller simple and the response rapid.

[0010] Optionally, the mounting base is provided with two mounting plates and a mounting sliding assembly. Both mounting plates are slidably fitted onto the mounting base. The mounting sliding assembly includes a mounting motor and a mounting bidirectional lead screw. The mounting bidirectional lead screw is rotatably mounted on the mounting base. The two ends of the mounting bidirectional lead screw with opposite thread directions pass through and are threaded onto the two mounting plates. The mounting motor is mounted on the mounting base and is used to drive the mounting bidirectional lead screw to rotate. The pressure roller is disposed between the two mounting plates.

[0011] By adopting the above technical solution, when the motor drives the bidirectional screw to rotate, the two mounting plates move synchronously toward each other or away from each other, thereby realizing the adjustment of the distance between the two mounting plates. On the one hand, it is convenient to quickly assemble and disassemble the pressure rollers, and on the other hand, it is convenient to install pressure rollers of different lengths and sizes, thereby simulating the actual vehicle load conditions of different tire ground contact, which has strong applicability.

[0012] Optionally, the detection box is fixedly equipped with two horizontal guide rods, both of which are arranged parallel to the piston rod of the horizontal cylinder, and both horizontal guide rods pass through and slide against the pressure frame.

[0013] By adopting the above technical solution, the horizontal guide rod plays a further limiting role in the horizontal sliding of the pressure frame, which helps to further ensure the stability of the pressure frame during horizontal sliding.

[0014] Optionally, the load-bearing fixing assembly includes a load-bearing fixing rod, a load-bearing movable rod, a load-bearing limiting rod, and a load-bearing driving component. The load-bearing fixing rod is fixedly installed on the top of the load-bearing seat. The load-bearing movable rod is arranged opposite to the load-bearing fixing rod and slidably engaged on the top of the load-bearing seat. The load-bearing driving component is used to drive the load-bearing movable rod to move towards or away from the load-bearing fixing rod. There are two load-bearing limiting rods, both of which are installed on the side of the load-bearing movable rod facing the load-bearing fixing rod.

[0015] By adopting the above technical solution, the load-bearing driving component is used to push the load-bearing movable rod to move towards the fixed rod. In conjunction with the two load-bearing limiting rods set on the movable rod, the side walls of the test block are clamped and fixed respectively, which helps to fully ensure the stability of the position of the test block after it is fixed.

[0016] Optionally, one of the bearing limiting rods is designated as a first limiting rod, which slides along the length of the bearing movable rod and engages with it. The bearing movable rod is provided with a bearing spring that drives the first limiting rod to move towards another bearing limiting rod. An inclined guide surface is provided at the end of the first limiting rod facing the bearing fixed rod. The bearing driving component includes a bearing screw, which is rotatably mounted on the side of the bearing movable rod away from the bearing fixed rod. The bearing screw passes through and is threaded into the bearing seat.

[0017] By adopting the above technical solution, when the bearing screw is rotated by force, the bearing movable rod drives the two bearing limiting rods to move towards or away from the bearing fixed rod. When the test block is positioned, the inclined guide surface at the front end of the first limiting rod will first contact the side of the test block and be squeezed and slid by the test block, thus facilitating the automatic positioning of the test block. The elastic force of the bearing spring helps to ensure the compressive stability of the test block, and at the same time, it is easy to compensate for the tolerance of the width of the test block, reducing the stringent requirements for processing accuracy during the test block testing.

[0018] Optionally, the testing chamber is provided with a bearing platform, and the bearing adjustment assembly includes a bearing rotating rod and a bearing motor. The bearing rotating rod is fixedly installed at the bottom of the bearing seat and rotatably installed on the bearing platform. A bearing worm is fixedly installed at the output end of the bearing motor, and a bearing worm wheel is coaxially fixedly installed on the bearing rotating rod. The bearing worm wheel meshes with the bearing worm.

[0019] By adopting the above technical solution, when the bearing motor drives the bearing worm to rotate, the bearing worm wheel drives the bearing rotating rod to rotate together, thereby ultimately realizing the adjustment of the tilt angle of the bearing seat and the test block fixed on the top of the bearing seat. The self-locking characteristic between the bearing worm wheel and the bearing worm helps to ensure the stability of the position of the bearing seat after the angle is adjusted, thus facilitating the stable loading of the test block by the pressure roller.

[0020] Optionally, the bottom of the bearing seat is provided with two sets of bearing grooves, which are located on both sides of the bearing rotating rod. Each set of bearing grooves is fitted with a bearing slider, and each bearing slider is rotatably mounted with a bearing clamp rod. Each bearing clamp rod passes through the vertical direction and slides to fit on the bearing platform.

[0021] By adopting the above technical solution, when the support seat rotates, the support slider slides synchronously in the support groove, and the support rod passing through the support platform provides vertical constraint for the rotation of the support seat. This helps to further ensure the stability of the support seat during rotation and ensure the accuracy of the support seat after angle adjustment, thereby ultimately improving the reliability of the test block at different angles.

[0022] Optionally, the support platform is provided with a support reinforcement component, which includes a support reinforcement seat and a reinforcement drive member. The support reinforcement seat is provided with support reinforcement parts that correspond one-to-one with the support levers. The reinforcement drive member is used to drive each support reinforcement part to move toward or away from each support lever.

[0023] By adopting the above technical solution, after the angle of the bearing seat is adjusted to the required position, the movement of each bearing reinforcement part is driven by the driving component so that each bearing reinforcement part abuts against each bearing rod, thereby achieving further pressing and fixing of each bearing rod. This helps to further suppress the deformation that may occur in the bearing seat under high load loading and fully ensures the stability of the bearing seat position during testing.

[0024] Secondly, this application provides a method for testing the high-temperature resistance of asphalt pavement, employing the following technical solution: A method for testing the high-temperature resistance performance of asphalt pavement, based on the aforementioned testing device, includes the following steps: S1, test block installation: placing the test block on a support seat and fixing it on the support seat using a support fixing component; S2, test block heating: heating the inside of the testing chamber using a heating mechanism and maintaining the temperature to a preset test temperature; S3, angle adjustment: adjusting the test block to the required preset angle by rotating the support seat using a support adjustment component according to testing requirements; S4, pressure simulation: first, driving the pressure roller downwards using a pressure vertical component to apply pressure to the surface of the test block. A set vertical pressure is applied to the surface. When the vertical pressure reaches the preset pressure value, the preset pressure value is maintained to simulate the static load of the vehicle. Subsequently or simultaneously, the horizontal pressure component drives the pressure frame and pressure roller to move in the horizontal direction, applying a preset horizontal shear force to the surface of the test block. When the horizontal shear force reaches the preset pressure value and is maintained for a preset time, the horizontal shear force applied to the surface of the test block is released. S5. After a certain interval, step S4 is repeated. When the number of repetitions reaches the preset number, the test is stopped. S6. The test block is removed, and the deformation of the area where the test block is released from the pressure roller is measured and recorded.

[0025] By adopting the above technical solution, the combination of a bearing seat with a precisely adjustable rotation angle and cyclic loading that applies vertical pressure and horizontal shear force facilitates the change of the final force direction of the test block, thereby simulating the oblique shear generated by the vehicle under different slopes. This achieves a high-fidelity simulation of the complex stress on the road surface, making the results of the high-temperature performance test more consistent with the actual situation of the asphalt pavement, and thus more realistically reflecting the complex stress and deformation behavior of the asphalt pavement under high temperature.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The combination of the load-bearing adjustment component driving the load-bearing seat to rotate, the pressure horizontal component driving the pressure roller to move horizontally, and the pressure vertical component driving the pressure roller to press down facilitates a more realistic simulation of the actual road, thereby making the results of the high-temperature performance test more consistent with the actual situation of the asphalt pavement, and thus more realistically reflecting the complex stress and deformation behavior of the asphalt pavement under high temperature.

[0027] 2. The load-bearing drive component pushes the load-bearing movable rod to move towards the fixed rod. In conjunction with the two load-bearing limiting rods set on the movable rod, the side walls of the test block are clamped and fixed respectively, which helps to fully ensure the stability of the position of the test block after it is fixed.

[0028] 3. When the bearing motor drives the bearing worm to rotate, the bearing worm wheel drives the bearing rotating rod to rotate together, thereby ultimately realizing the adjustment of the tilt angle of the bearing seat and the test block fixed on the top of the bearing seat. The self-locking characteristic between the bearing worm wheel and the bearing worm helps to ensure the stability of the position of the bearing seat after the angle is adjusted, thus facilitating the stable loading of the test block by the pressure roller. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0030] Figure 2 This is a schematic diagram of the internal structure of the detection box in an embodiment of this application.

[0031] Figure 3 yes Figure 2 A magnified view of part A in the diagram.

[0032] Figure 4 This is a partial cross-sectional schematic diagram of the support base in an embodiment of this application.

[0033] Figure 5 This is a partial cross-sectional schematic diagram of the mounting base in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures: 1. Inspection box; 101. Box door; 2. Bearing seat; 3. Bearing fixed rod; 4. Bearing movable rod; 5. Bearing limiting rod; 501. First limiting rod; 502. Second limiting rod; 6. Bearing lead screw; 7. Rotating handle; 8. Bearing movable groove; 9. Bearing spring; 10. Inclined guide surface; 11. Bearing platform; 12. Bearing rotating rod; 13. Bearing motor; 14. Bearing worm gear; 15. Bearing worm wheel; 16. Bearing slide groove; 17. Bearing slider; 18. 19. Bearing support rod; 20. Bearing reinforcement seat; 21. Bearing reinforcement part; 22. Reinforced motor; 23. Reinforced lead screw; 24. Reinforced guide rod; 25. Electric heating plate; 26. Horizontal cylinder; 27. Vertical cylinder; 28. Pressing frame; 29. ​​Pressing roller; 281. Pressing mounting part; 282. Roller part; 283. Rotating shaft part; 284. Horizontal guide rod; 30. Mounting seat; 31. Mounting plate; 32. Mounting double lead screw; 33. Mounting motor; 34. Pressing mounting groove. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0036] This application discloses a device for testing the high-temperature resistance of asphalt pavement.

[0037] Reference Figure 1 and Figure 2The asphalt pavement high-temperature resistance performance testing device includes a testing chamber 1, wherein the testing chamber 1 is hinged with two doors 101 to allow for either connection or disconnection between the inside and outside of the testing chamber 1. The testing chamber 1 is equipped with a load-bearing mechanism, a heating mechanism, and a pressure-applying mechanism. The load-bearing mechanism includes a load-bearing base 2, a load-bearing fixing component, and a load-bearing adjustment component. The load-bearing base 2 is rectangular, and in this embodiment, the length direction of the load-bearing base 2 is the x-axis direction, and the width direction of the load-bearing base 2 is the y-axis direction.

[0038] Reference Figure 3 and Figure 4 The load-bearing fixing assembly includes a load-bearing fixing rod 3, a load-bearing movable rod 4, a load-bearing limiting rod 5, and a load-bearing driving component. The load-bearing fixing rod 3 is positioned along the y-axis and fixedly installed on the top of the load-bearing seat 2. The load-bearing movable rod 4 is directly opposite the load-bearing fixing rod 3 and slides along the x-axis on the top of the load-bearing seat 2. The load-bearing driving component includes a load-bearing lead screw 6, which is rotatably mounted on the side of the load-bearing movable rod 4 away from the load-bearing fixing rod 3. The load-bearing lead screw 6 passes through and is threaded into the load-bearing seat 2, so that when force is applied to rotate the load-bearing lead screw 6, the load-bearing movable rod 4 moves towards or away from the load-bearing fixing rod 3. To facilitate the rotation of the load-bearing lead screw 6, a rotating handle 7 is fixedly connected to the end of the load-bearing lead screw 6 away from the load-bearing fixing rod 3.

[0039] Reference Figure 3 and Figure 5 Two load-bearing limiting rods 5 are provided, both installed on the side of the movable load-bearing rod 4 facing the fixed load-bearing rod 3. One load-bearing limiting rod 5 is designated as the first limiting rod 501, and the other load-bearing limiting rod 5 is designated as the second limiting rod 502. The second limiting rod 502 and the second limiting rod 502 are respectively located near the two ends of the movable load-bearing rod 4 along its length. Specifically, the second limiting rod 502 is fixedly installed on the movable load-bearing rod 4. The movable load-bearing rod 4 has a load-bearing movable groove 8 extending along the x-axis on the side facing the fixed load-bearing rod 3. The first limiting rod 501 slides and engages within the load-bearing movable groove 8, that is, the first limiting rod 501 slides and engages with the movable load-bearing rod 4 along its length.

[0040] Continue to refer to Figure 3 and Figure 5A bearing spring 9 is installed inside the bearing movable groove 8. One end of the bearing spring 9 is connected to the groove wall of the bearing movable groove 8, and the other end is connected to the first limiting rod 501, so as to apply a spring force to the first limiting rod 501 to move in the direction of the second limiting rod 502. The ends of the first limiting rod 501 and the second limiting rod 502 facing the bearing fixing rod 3 are provided with inclined guide surfaces 10. When the test block is positioned, the inclined guide surfaces 10 at the front end of the first limiting rod 501 or the second limiting rod 502 will first contact the side of the test block, and then realize the automatic guidance and positioning of the test block. The spring force of the bearing spring 9 helps to ensure the stability of the test block when it is pressed and fixed, and at the same time, it is easy to compensate for the tolerance of the width of the test block, reducing the stringent requirements for processing accuracy during the test block testing.

[0041] Reference Figure 2 and Figure 3 The bearing housing contains a bearing platform 11, with a bearing seat 2 located on top of the bearing platform 11. A bearing adjustment assembly is used to drive the bearing seat 2 to rotate. Specifically, the bearing adjustment assembly includes a bearing rotating rod 12 and a bearing motor 13. The bearing rotating rod 12 is fixedly installed at the bottom of the bearing seat 2, and is rotatably mounted on the top of the bearing platform 11 along the y-axis. The bearing motor 13 is mounted on the top of the bearing platform 11, and a bearing worm gear 14 is fixedly installed at the output end of the bearing motor 13. A bearing worm wheel 15 is coaxially fixedly installed on the bearing rotating rod 12, meshing with the bearing worm gear 14, so that the bearing motor 13 drives the bearing rotating rod 12 and the bearing seat 2 to rotate through the cooperation of the bearing worm gear 14 and the bearing worm wheel 15.

[0042] Reference Figure 3 and Figure 4 To further ensure the stability of the bearing seat 2 during rotation, two sets of bearing grooves 16 extending along the x-axis are provided at the bottom of the bearing seat 2. In this embodiment, each set of bearing grooves 16 has two sections along the y-axis, and the two sets of bearing grooves 16 are located on both sides of the bearing rotating rod 12 along the x-axis. Each bearing groove 16 has a bearing slider 17 that slides within it, and each bearing slider 17 has a bearing retainer 18 that is rotatably mounted at its bottom. Each bearing retainer 18 passes vertically and slides within the bearing platform 11 to further limit the rotation of the bearing seat 2.

[0043] Reference Figure 2 and Figure 3The bearing platform 11 is provided with a bearing reinforcement assembly, which includes a bearing reinforcement seat 19 and a reinforcement drive member. In this embodiment, the bearing reinforcement seat 19 slides along the y-axis direction and is fitted to the top of the bearing platform 11. The bearing reinforcement seat 19 is provided with bearing reinforcement parts 20 that correspond one-to-one with the bearing levers 18. In this embodiment, each bearing reinforcement part 20 is located on one side of each bearing lever 18 along the y-axis direction. The reinforcement drive member is used to drive each bearing reinforcement part 20 to move along the y-axis towards or away from each bearing lever 18, so as to further tighten and fix the position of each bearing lever 18, thereby helping to further suppress the deformation that may occur in the bearing seat 2 under high load and fully ensure the stability of the position of the bearing seat 2 during detection.

[0044] Continue to refer to Figure 2 and Figure 3 In this embodiment, the reinforcing drive component includes a reinforcing motor 21, a reinforcing lead screw 22, and a reinforcing guide rod 23. The reinforcing lead screw 22 is fixedly installed at the output end of the reinforcing motor 21. The reinforcing lead screw 22 passes through the bearing reinforcement seat 19 along the y-axis and is threadedly engaged with it. The reinforcing guide rod 23 is arranged parallel to the reinforcing lead screw 22 and is fixedly installed on the top of the bearing platform 11. The reinforcing guide rod 23 passes through the bearing reinforcement seat 19 and slides to engage with it. This allows the bearing reinforcement seat 19 to move towards or away from the bearing retaining rods 18 under the limiting action of the bearing guide rod when the reinforcing motor 21 drives the reinforcing lead screw 22 to rotate.

[0045] Reference Figure 2 The heating mechanism is used to heat the test block inside the test chamber 1. In this embodiment, the heating mechanism includes two electric heating plates 24 arranged opposite each other. The two electric heating plates 24 are arranged close to the top of the test chamber 1 to achieve stable heating inside the test chamber 1.

[0046] Reference Figure 2 The pressure applying mechanism includes a vertical pressure applying component, a horizontal pressure applying component, a pressure frame 27, and pressure rollers 28. The horizontal pressure applying component drives the pressure frame 27 to move horizontally. Specifically, the horizontal pressure applying component includes a horizontal cylinder 25 arranged along the x-axis and horizontally fixedly installed inside the detection chamber 1. The pressure frame 27 is installed at one end of the piston rod of the horizontal cylinder 25, so that the horizontal cylinder 25 drives the pressure frame 27 to move horizontally. To further ensure the stability of the pressure frame 27 when driven by the horizontal cylinder 25, two horizontal guide rods 29 arranged along the x-axis are fixedly installed inside the detection chamber 1. Both horizontal guide rods 29 are parallel to the piston rod of the horizontal cylinder 25 and pass through and slide against the pressure frame 27 to limit the horizontal movement of the pressure frame 27.

[0047] Reference Figure 3and Figure 4 The pressure vertical assembly is disposed on the pressure frame 27 and is used to drive the pressure roller 28 to move in the vertical direction. Specifically, the pressure vertical assembly includes a vertical cylinder 26 vertically mounted on the pressure frame 27 and a mounting seat 30 mounted on the bottom of the piston rod of the vertical cylinder 26. The pressure roller 28 is disposed on the mounting seat 30 so that the vertical cylinder 26 drives the mounting seat 30 to move in the vertical direction.

[0048] Reference Figure 3 and Figure 5 Furthermore, the bottom of the mounting base 30 is provided with two mounting plates 31 and a mounting sliding assembly. Both mounting plates 31 slide and engage with the bottom of the mounting base 30 along the y-axis. The mounting sliding assembly includes a mounting motor 33 and a mounting bidirectional lead screw 32. The mounting bidirectional lead screw 32 is set along the y-axis and rotatably mounted on the mounting base 30. The two ends of the mounting bidirectional lead screw 32 with opposite threads are respectively threaded and engaged with the two mounting plates 31. The mounting motor 33 is mounted on the mounting base 30 and is used to drive the mounting bidirectional lead screw 32 to rotate, so that when the mounting motor 33 drives the mounting bidirectional lead screw 32 to rotate, the two mounting plates 31 move in a direction closer to or further away from each other along the y-axis.

[0049] Reference Figure 3 The pressure roller 28 includes two pressure mounting parts 281, a roller part 282, and a rotating shaft part 283. The two ends of the rotating shaft part 283 are respectively inserted and rotatably engaged with the two pressure mounting parts 281. The roller part 282 is coaxially fixedly mounted on the rotating shaft part 283. Each of the two mounting plates 31 has a pressure mounting groove 34 on one side facing each other, which is engaged with the two pressure mounting parts 281. This allows the pressure roller 28 to be rotated and mounted on the mounting base 30 by clamping the two pressure mounting parts 281 with the two mounting plates 31. At the same time, the distance between the two mounting plates 31 can be adjusted, which makes it easier to simulate the actual vehicle load conditions with different tire ground contact, and has strong applicability.

[0050] The implementation principle of this application embodiment is as follows: the bearing motor 13 drives the bearing seat 2 to rotate, which is convenient to simulate the oblique shear of the tire on the road surface when the vehicle is on different slopes. The horizontal cylinder 25 drives the horizontal movement of the pressure frame 27 and the pressure roller 28 to simulate the longitudinal shear during braking / acceleration. The vertical cylinder 26 drives the downward pressure of the pressure roller 28 to simulate the vertical load. The combination of the three facilitates a more realistic simulation of the actual road, so that the results of the high temperature resistance test correspond more closely to the actual situation of the asphalt pavement, and thus more realistically reflects the complex stress deformation behavior of the asphalt pavement under high temperature.

[0051] This application also discloses a method for testing the high-temperature resistance of asphalt in asphalt pavement. The method includes the following steps: S1, test block installation, placing the test block on the support seat 2, and fixing the test block on the support seat 2 by the support fixing component.

[0052] S2, Test block heating: The heating mechanism heats the inside of the test chamber 1 and keeps it at a preset test temperature.

[0053] S3, Angle Adjustment: According to the test requirements, the bearing seat 2 is rotated by the bearing adjustment component to adjust the test block to the required preset angle.

[0054] S4, Pressure Simulation: First, the vertical pressure component drives the pressure roller 28 to move downward, applying a set vertical pressure to the surface of the test block. When the vertical pressure reaches the preset pressure value, the preset pressure value is maintained to simulate vehicle static load. Subsequently or simultaneously, the horizontal pressure component drives the pressure frame 27 and the pressure roller 28 to move horizontally, applying a preset horizontal shear force to the surface of the test block. When the horizontal shear force reaches the preset pressure value and is maintained for a preset time, the horizontal shear force applied to the surface of the test block is released.

[0055] S5. After a certain time interval, repeat step S4. Stop the experiment when the number of repetitions reaches the preset number.

[0056] S6. Take out the test block and measure and record the deformation of the area where the test block is released from the pressure roller 28.

[0057] The implementation principle of the high-temperature resistance test method for asphalt pavement in this application embodiment is as follows: by combining the bearing seat 2 with a precisely adjustable rotation angle with cyclic loading that applies vertical pressure and horizontal shear force, it is easy to change the final force direction of the test block, thereby simulating the oblique shear generated by the vehicle under different slopes, realizing a high simulation of the complex stress of the pavement, so that the results of the high-temperature resistance test are more consistent with the actual situation of the asphalt pavement, and thus more realistically reflect the complex stress deformation behavior of the asphalt pavement under high temperature.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for testing the high-temperature resistance of asphalt pavement, comprising a testing chamber (1), characterized in that: The testing chamber (1) is equipped with a bearing mechanism, a heating mechanism, and a pressure mechanism. The bearing mechanism includes a bearing seat (2), a bearing fixing component, and a bearing adjusting component. The bearing fixing component is disposed on the bearing seat (2) and is used to fix the test block placed on the bearing seat (2). The bearing adjusting component is used to drive the bearing seat (2) to rotate. The heating mechanism is used to heat the test block in the testing chamber (1). The pressure mechanism includes a pressure vertical component, a pressure horizontal component, a pressure frame (27), and a pressure roller (28). The pressure horizontal component is used to drive the pressure frame (27) to move in the horizontal direction. The pressure vertical component is disposed on the pressure frame (27) and is used to drive the pressure roller (28) to move in the vertical direction.

2. The device for testing the high-temperature resistance of asphalt pavement as described in claim 1, characterized in that: The vertical pressure assembly includes a vertical cylinder (26) vertically mounted on the pressure frame (27) and a mounting seat (30) mounted on the bottom of the piston rod of the vertical cylinder (26), and the pressure roller (28) is rotatably fitted to the mounting seat (30); the horizontal pressure assembly includes a horizontal cylinder (25) horizontally mounted inside the detection box (1), and the pressure frame (27) is mounted on the piston rod of the horizontal cylinder (25).

3. The device for testing the high-temperature resistance of asphalt pavement as described in claim 2, characterized in that: The mounting base (30) is provided with two mounting plates (31) and a mounting sliding assembly. Both mounting plates (31) are slidably fitted onto the mounting base (30). The mounting sliding assembly includes a mounting motor (33) and a mounting bidirectional lead screw (32). The mounting bidirectional lead screw (32) is rotatably mounted on the mounting base (30). The two ends of the mounting bidirectional lead screw (32) with opposite thread directions are respectively threaded and fitted onto the two mounting plates (31). The mounting motor (33) is mounted on the mounting base (30) and is used to drive the mounting bidirectional lead screw (32) to rotate. The pressure roller (28) is disposed between the two mounting plates (31).

4. The device for testing the high-temperature resistance of asphalt pavement as described in claim 2, characterized in that: The detection box (1) is fixedly installed with two horizontal guide rods (29). Both horizontal guide rods (29) are arranged parallel to the piston rod of the horizontal cylinder (25). Both horizontal guide rods (29) pass through and slide to engage with the pressure frame (27).

5. The device for testing the high-temperature resistance of asphalt pavement as described in claim 1, characterized in that: The load-bearing fixing assembly includes a load-bearing fixing rod (3), a load-bearing movable rod (4), a load-bearing limiting rod (5), and a load-bearing driving component. The load-bearing fixing rod (3) is fixedly installed on the top of the load-bearing seat (2). The load-bearing movable rod (4) is arranged opposite to the load-bearing fixing rod (3) and slides and engages with the top of the load-bearing seat (2). The load-bearing driving component is used to drive the load-bearing movable rod (4) to move towards or away from the load-bearing fixing rod (3). There are two load-bearing limiting rods (5), both of which are installed on the side of the load-bearing movable rod (4) facing the load-bearing fixing rod (3).

6. The device for testing the high-temperature resistance of asphalt pavement as described in claim 5, characterized in that: One of the bearing limiting rods (5) is designated as a first limiting rod (501). The first limiting rod (501) slides along the length of the bearing movable rod (4) and is engaged with the bearing movable rod (4). The bearing movable rod (4) is provided with a bearing spring (9) that drives the first limiting rod (501) to move closer to the other bearing limiting rod (5). The end of the first limiting rod (501) facing the bearing fixed rod (3) is provided with an inclined guide surface (10). The bearing driving component includes a bearing screw (6). The bearing screw (6) is rotatably installed on the side of the bearing movable rod (4) away from the bearing fixed rod (3). The bearing screw (6) passes through and is threaded into the bearing seat (2).

7. The device for testing the high-temperature resistance of asphalt pavement as described in claim 1, characterized in that: The detection box (1) is provided with a bearing platform (11). The bearing adjustment component includes a bearing rotating rod (12) and a bearing motor (13). The bearing rotating rod (12) is fixedly installed at the bottom of the bearing seat (2). The bearing rotating rod (12) is rotatably installed on the bearing platform (11). The output end of the bearing motor (13) is fixedly installed with a bearing worm gear (14). The bearing rotating rod (12) is coaxially fixedly installed with a bearing worm wheel (15). The bearing worm wheel (15) meshes with the bearing worm gear (14).

8. The device for testing the high-temperature resistance of asphalt pavement as described in claim 7, characterized in that: The bottom of the bearing seat (2) is provided with two sets of bearing grooves (16). The two sets of bearing grooves (16) are located on both sides of the bearing rotating rod (12). The bearing sliders (17) are slidably fitted in both sets of bearing grooves (16). Each bearing slider (17) is rotatably installed with a bearing clamp (18). Each bearing clamp (18) is inserted vertically and slidably fitted on the bearing platform (11).

9. The device for testing the high-temperature resistance of asphalt pavement as described in claim 8, characterized in that: The bearing platform (11) is provided with a bearing reinforcement component, which includes a bearing reinforcement seat (19) and a reinforcement drive member. The bearing reinforcement seat (19) is provided with bearing reinforcement parts (20) that correspond one-to-one with the bearing levers (18). The reinforcement drive member is used to drive each bearing reinforcement part (20) to move toward or away from each bearing lever (18).

10. A method for testing the high-temperature resistance of asphalt in asphalt pavement, characterized in that: The asphalt pavement asphalt high temperature resistance performance testing device according to any one of claims 1 to 9 includes the following steps: S1, test block installation, placing the test block on the bearing seat (2), and fixing the test block on the bearing seat (2) by the bearing fixing component; S2, test block heating, the inside of the test chamber (1) is heated and kept at a constant temperature to the preset test temperature by the heating mechanism; S3, Angle adjustment: According to the test requirements, the bearing seat (2) is driven to rotate by the bearing adjustment component to adjust the test block to the required preset angle; S4, Pressure Simulation: First, the vertical pressure component drives the pressure roller (28) to move downwards, applying a set vertical pressure to the surface of the test block. When the vertical pressure reaches the preset pressure value, the preset pressure value is maintained to simulate vehicle static load. Then, or simultaneously, the horizontal pressure component drives the pressure frame (27) and the pressure roller (28) to move in the horizontal direction, applying a preset horizontal shear force to the surface of the test block. When the horizontal shear force reaches the preset pressure value and is maintained for a preset time, the horizontal shear force applied to the surface of the test block is released. S5. After a certain time interval, repeat step S4. Stop the experiment when the number of repetitions reaches the preset number. S6. Take out the test block and measure and record the deformation of the area where the test block is released from the pressure roller (28).

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